DUKE 40
DUKE 40 is a Texas oil lease in Martin County, Railroad Commission district 08, operated by Crownquest Operating, LLC. It has 2 wellbores on file with the Commission. Reported production runs from January 2013 to August 2026, totalling 136,660 barrels. The lease is currently producing. Fitting a decline curve to that history and pricing the remaining production at today's forward curve values the whole lease — a 100% undivided interest — at about $875K, with roughly $165K expected over the next twelve months. An individual royalty owner receives their own decimal interest times that figure. Over the last twelve months on file it averaged 249 barrels a month, about 124 per wellbore. Its strongest month on the record we hold was May 2016, at 1,024 barrels. In our own backtest, leases producing at this rate are forecast to within about 22% of what they went on to produce, and that measured error is the range shown on the page rather than a confidence of our own devising.
Key facts about DUKE 40
- Who operates DUKE 40?
- DUKE 40 is operated by Crownquest Operating, LLC, Railroad Commission of Texas operator number 191554.
- Where is DUKE 40?
- DUKE 40 is a Texas oil lease in Martin County, Texas, in Railroad Commission district 08. Its Railroad Commission lease number is 43922.
- Is DUKE 40 still producing?
- DUKE 40 is currently producing. The most recent month of production reported to the Railroad Commission of Texas for DUKE 40 is August 2026.
- How much has DUKE 40 produced?
- DUKE 40 has reported 136,660 barrels of oil (bbl) to the Railroad Commission of Texas between January 2013 and August 2026, from 2 wellbores.
- How much is DUKE 40 worth?
- The remaining production from DUKE 40 is estimated to be worth about $875K in total as of 26 August 2026, within a range of $682K to $1.1M. That figure is the whole lease, undivided — not any one owner's share. A royalty interest in DUKE 40 is a fraction of it. The estimate fits an Arps decline curve to the production DUKE 40 has already reported, prices the remaining production at the current forward strip, and discounts it at 12% a year. The figure shown for DUKE 40 is an estimate of value, not an offer and not an appraisal.
- How much income does DUKE 40 generate in a year?
- DUKE 40 is forecast to net about $165K across the whole undivided lease over the twelve months following 26 August 2026, before income tax. A royalty owner in DUKE 40 receives a fraction of that, set by the decimal interest printed on their check stub.
Lease record
| Operator | Crownquest Operating, LLC |
|---|---|
| Field | Spraberry (Trend Area) |
| County | Martin County, Texas |
| RRC district | 08 |
| Lease number | 43922 |
| Wellbores | 2 |
| Reported production | 136,660 bbl |
| First reported | |
| Last reported | |
| Estimated royalty value | $875K |
Where DUKE 40 sits
Source: Railroad Commission of Texas lease production records, complete through . Figures on this page were computed on .
Production figures are as reported to the Railroad Commission of Texas. The value shown is an estimate produced by fitting a decline curve to that reported history; it is not an offer or an appraisal. How this estimate is calculated.